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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: dh-param.c,v 1.2 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * Reading Diffie-Hellman parameters |
6 | * |
7 | * (c) 2004 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
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30 | /*----- Header files ------------------------------------------------------*/ |
31 | |
32 | #include "dh.h" |
33 | #include "ptab.h" |
34 | |
35 | /*----- Main code ---------------------------------------------------------*/ |
36 | |
37 | /* --- @dh_parse@ --- * |
38 | * |
39 | * Arguments: @qd_parse *qd@ = parser context |
40 | * @dh_param *dp@ = parameters to fill in |
41 | * |
42 | * Returns: Zero if OK, nonzero on error. |
43 | * |
44 | * Use: Parses a prime group string. This is either one of the |
45 | * standard group strings, or a %$p$%, %$q$%, %$g$% triple |
46 | * separated by commas. |
47 | */ |
48 | |
49 | static void getinfo(dh_param *dp, pdata *pd) |
50 | { dp->p = &pd->p; dp->q = &pd->q; dp->g = &pd->g; } |
51 | |
52 | int dh_parse(qd_parse *qd, dh_param *dp) |
53 | { |
54 | mp *p = MP_NEW, *q = MP_NEW, *g = MP_NEW; |
55 | const pentry *pe; |
56 | |
57 | for (pe = ptab; pe->name; pe++) { |
58 | if (qd_enum(qd, pe->name) >= 0) { |
59 | getinfo(dp, pe->data); |
60 | goto found; |
61 | } |
62 | } |
63 | if ((p = qd_getmp(qd)) == 0) goto fail; |
64 | qd_delim(qd, ','); if ((q = qd_getmp(qd)) == 0) goto fail; |
65 | qd_delim(qd, ','); if ((g = qd_getmp(qd)) == 0) goto fail; |
66 | dp->p = p; dp->q = q; dp->g = g; |
67 | found: |
68 | return (0); |
69 | |
70 | fail: |
71 | mp_drop(p); mp_drop(q); mp_drop(g); |
72 | return (-1); |
73 | } |
74 | |
75 | /*----- Test rig ----------------------------------------------------------*/ |
76 | |
77 | #ifdef TEST_RIG |
78 | |
79 | #include "fibrand.h" |
80 | |
81 | int main(void) |
82 | { |
83 | const pentry *pe; |
84 | const char *e; |
85 | int ok = 1; |
86 | grand *gr; |
87 | |
88 | gr = fibrand_create(0); |
89 | fputs("checking standard prime fields: ", stdout); |
90 | for (pe = ptab; pe->name; pe++) { |
91 | dh_param dp; |
92 | group *g; |
93 | getinfo(&dp, pe->data); |
94 | g = group_prime(&dp); |
95 | e = G_CHECK(g, gr); |
96 | G_DESTROYGROUP(g); |
97 | dh_paramfree(&dp); |
98 | if (e) { |
99 | fprintf(stderr, "\n*** group %s fails: %s\n", pe->name, e); |
100 | ok = 0; |
101 | } |
102 | putchar('.'); |
103 | fflush(stdout); |
104 | } |
105 | gr->ops->destroy(gr); |
106 | fputs(ok ? " ok\n" : " failed\n", stdout); |
107 | return (!ok); |
108 | } |
109 | |
110 | #endif |
111 | |
112 | /*----- That's all, folks -------------------------------------------------*/ |